Swift Boats underway in the Dong Tranh River during Operation Jackstay in Vietnam.

Operation 'Jackstay' in Vung Tau, Vietnam. Several ships at anchor in Dong Tranh River. A Swift Boat underway. A 50 caliber machine gun in the boat. A life jacket hangs from the gun mount. A United States flag flies in the breeze. A crew member looks out over the water. A shoreline in the background. The Swift Boat underway en route to Cat-Lo naval base. A crew man stands on the deck. A merchant tug and a barge underway. Junk being passed in the river by Patrol Craft PCF-31. Crewmen cover the 50 caliber machine gun.